Four Way Valve Abnormality - Daikin Super Multi NX C-Series Service Manual

Troubleshooting

5.15 Four Way Valve Abnormality

EA
Remote
Controller
Display
Outdoor Unit LED
A
Display
Method of The liquid pipe thermistor, the outdoor temperature thermistor and the outdoor unit heat
Malfunction exchanger thermistor are checked to see if they function within their normal ranges in the
operating mode.
Detection
Malfunction
Either of the following conditions occurs 3 minutes after the compressor has started.
" Cooling / dry operation
Decision
(Outdoor unit heat exchanger temperature – Liquid pipe temperature) < –5°C
Conditions
" Heating operation
(Liquid pipe temperature – Outdoor unit heat exchanger temperature) < –5°C
" Connector in poor contact
Supposed
" Thermistor defective
Causes
" Outdoor unit PCB defective
" Four way valve coil or harness defective
" Four way valve defective
" Foreign substance mixed in refrigerant
186
5 1 4 2 1 3 1 4 1
SiE12-411
Service Diagnosis